@article{algebraicapproachtodirectedroughsets,
  title = {Algebraic Approach to Directed Rough Sets},
  author = {Mani A and Sandor Radeleczki},
  year = {2020},
  eprint = {2004.12171},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2004.12171v1},
}